Accumulation of vitamin-a in the liver and blood of bulls at different levels in the diets of bulls fed with food industry waste

The paper summarizes the results of studies to determine the A-vitamin status of black-and-white bull calves at different levels in the diets of those fed on food industry waste (barda, pulp, beer pellet).The conducted analyses of liver samples and blood serum of experimental bulls found that at the beginning of bard fattening, up to 24.72-26.34 micrograms of vitamin were deposited in the liver per g of raw tissue, with the pulp type its concentration was slightly lower and ranged from 22.46 to 23.64 micrograms/g. The maximum concentration of this vitamin was detected in the liver of bulls fattened on beer pellets, which ranged from 67.58 to 69.80 mcg/g of raw tissue. By the end of the bard fattening, the concentration of this vitamin in the liver increased 1.5 times (P